1 4 0 http://purl.obolibrary.org/obo/SO_0001563 copy_number_change 'copy_number_change' SubClassOf 'structural_variant' 'copy_number_change' SubClassOf http://purl.obolibrary.org/obo/SO_0002160 http://purl.obolibrary.org/obo/SO_0002160 sequence_length_variant 'sequence_length_variant' SubClassOf 'structural_variant' http://purl.obolibrary.org/obo/SO_0002161 short_tandem_repeat_change 'short_tandem_repeat_change' SubClassOf 'sequence_length_variant' http://purl.obolibrary.org/obo/SO_0002162 short_tandem_repeat_expansion 'short_tandem_repeat_expansion' SubClassOf 'short_tandem_repeat_change' http://purl.obolibrary.org/obo/SO_0002163 short_tandem_repeat_contraction 'short_tandem_repeat_contraction' SubClassOf 'short_tandem_repeat_change'